Datasheet

ARMulator Basics

2.10.6 Stack tracker

The stack tracker examines the contents of the stack pointer (r13) after each instruction.

It keeps a record of the lowest value and from this it can work out the maximum size of

the stack. ARMulator runs more slowly with stack tracking enabled.

The

StackUse

model continually monitors the stack pointer and reports the amount of

stack used in $statistics. It must be configured with the location of the stack.

The stack tracker is disabled by default. To enable the stack tracker, edit your copy of

default.ami

1. Find the line:

{ StackUse=No_StackUse

2. Change it to:

{ StackUse=Default_StackUse

Before initialization the stack pointer can contain values outside the stack limits. You

must configure the stack limits so that the stack tracker can ignore these

pre-initialization values. This configuration is in

peripherals.ami

{ Default_StackUse=StackUse

StackBase=0x80000000

StackLimit=0x70000000

}

StackBase

is the address of the top of the stack.

StackLimit

is a lower limit for the stack.

Changing these values does not reposition the stack in memory. To reposition the stack,

you must reconfigure the debug monitor model.

2.10.7 Tube

The tube is a memory-mapped register. If you write a printable character to it, the

character appears on the console. It allows you to check that writes are taking place to

a specified location in memory.

You can change the address at which the Tube is mapped. This is controlled by an entry

peripherals.ami

{Default_Tube=Tube

Range:Base=0x0d800020

}

This is the default address.